<template>
  <div>
    <!--面包屑 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-alert title="注意:只允许为第三级分类设置相关参数" type="warning" show-icon size="medium"></el-alert>
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <el-cascader :options="cateList" :props="cascaderProps" v-model="selectedKeys" @change="cateChanged" clearable style="width: 250px">
          </el-cascader>
        </el-col>
      </el-row>
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtn" plain @click="addDialogVisible = true">添加参数 </el-button>
          <!-- 动态Table -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <el-input class="input-new-tag" ref="saveTagInput" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                  size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"></el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)" plain>编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)" plain>删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtn" plain @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态Table -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                  ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"></el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)" plain>编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)" plain>删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @closed="addDialogClosed">
      <span slot="footer" class="dialog-footer">
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisible" width="100pxs" @closed="editDialogClosed">
      <span slot="footer" class="dialog-footer">
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        cateList: [],
        cascaderProps: {
          value: 'cat_id',
          label: 'cat_name',
          children: 'children'
        },
        selectedKeys: [],
        activeName: 'many',
        //动态参数表单数据
        manyTableData: [],
        //静态属性表单数据
        onlyTableData: [],
        addDialogVisible: false,
        addForm: {
          attr_name: ''
        },
        addFormRules: {
          attr_name: [
            { required: true, message: '请输入参数名称', trigger: 'blur' }
          ]
        },
        editDialogVisible: false,
        editForm: {
          attr_name: ''
        },
        editFormRules: {
          attr_name: [
            { required: true, message: '请输入参数名称', trigger: 'blur' }
          ]
        },
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      async getCateList() {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          this.$message.error('获取商品分类失败!')
        }
        this.cateList = res.data
      },
      //监听级联选择框的变化
      async cateChanged() {
        this.getParamsData()
      },
      //Tab点击事件的处理函数
      async handleTabClick() {
        console.log(this.activeName)
        this.getParamsData()
      },
      //获取参数的列表数据
      async getParamsData() {
        if (this.selectedKeys.length !== 3) {
          this.selectedKeys = []
          this.manyTableData = []
          this.onlyTableData = []
          return
        }
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: this.activeName }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          //控制按钮与文本框的切换显示
          item.inputVisible = false
          //文本框中输入的内容
          item.inputValue = ''
        })
        console.log(res.data)
        if (this.activeName === 'many') this.manyTableData = res.data
        else this.onlyTableData = res.data
      },
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      //增加参数
      addParams() {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.post(
            `categories/${this.cateId}/attributes`,
            {
              attr_name: this.addForm.attr_name,
              attr_sel: this.activeName
            }
          )
          console.log(res)
          if (res.meta.status !== 201) {
            this.$message.error('添加参数失败')
          }
          this.$message.success('添加参数成功')
          this.addDialogVisible = false
          this.getParamsData()
        })
      },
      //点击按钮，展示修改对话框
      async showEditDialog(attr_id) {
        const {
          data: res
        } = await this.$http.get(
          `categories/${this.cateId}/attributes/${attr_id}`,
          { params: { attr_sel: this.activeName } }
        )
        if (res.meta.status != 200) {
          return this.$message.error('获取参数信息失败!')
        }
        this.editForm = res.data
        this.editDialogVisible = true
      },
      //重置修改的表单
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      },
      editParams() {
        this.$refs.editFormRef.validate(async valid => {
          if (!valid) return
          const {
            data: res
          } = await this.$http.put(
            `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
            { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
          )
          if (res.meta.status !== 200) return this.$message.error('修改参数失败!')
          this.$message.success('修改参数成功!')
          this.getParamsData()
          this.editDialogVisible = false
        })
      },
      //根据id删除对应的参数项
      async removeParams(attr_id) {
        const confirmResult = await this.$confirm(
          '此操作将永久删除改参数，是否继续？',
          '提示',
          {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }
        ).catch(err => err)
        if (confirmResult !== 'confirm') return this.$message.info('已取消删除!')
        const { data: res } = await this.$http.delete(
          `categories/${this.cateId}/attributes/${attr_id}`
        )
        if (res.meta.status !== 200) {
          return this.$message.error('删除失败!')
        }
        this.$message.success('删除参数成功')
        this.getParamsData()
      },
      //文本框失去焦点，或者点击enter时触发
      async handleInputConfirm(row){
        if(row.inputValue.trim().length === 0){
          return
        }
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        //把新的tag(即attr_vals)传到后端
        this.saveAttrVals(row)
      },
      //点击按钮展示文本输入框
      showInput(row){
        row.inputVisible = true
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
      },
      //删除对应参数可选项
      handleClose(i,row){
        row.attr_vals.splice(i,1)
        this.saveAttrVals(row)
      },
      //对attr_valus的操作，保存到数据库中
      async saveAttrVals(row) {
        const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
        if(res.meta.status !== 200){
          return this.$message.error('修改参数项失败')
        }
        this.$message.success('修改参数项成功')
      }
    },
    computed: {
      isBtn() {
        if (this.selectedKeys.length !== 3) return true
        else return false
      },
      //当前选中的三级分类的id
      cateId() {
        if (this.selectedKeys.length === 3) {
          return this.selectedKeys[2]
        }
        return null
      },
      //判断对话框标题
      titleText() {
        if (this.activeName === 'many') return '动态参数'
        else return '静态属性'
      },
    }
  }
</script>

<style lang="less" scoped>
  .cat_opt {
    margin: 15px 0;
  }
  .el-tag {
    margin: 10px;
  }
  .input-new-tag {
    width: 120px;
  }
</style>